Wastewater Treatment (STP) Calculator
The Wastewater Treatment (STP) Calculator finds the design flow, BOD load, and aeration tank volume for a sewage treatment plant. Example: for a 500-person facility at 120 L/person/day, BOD 250→30 mg/L, Design flow = 60 m³/day, BOD removal = 88 %, Aeration volume = 17.9 m³ (per DENR DAO 2016-08).
How it works
Computed from your inputs per DENR DAO 2016-08.
Worked example (Plumbing & Pumps)
Inputs: a 500-person facility at 120 L/person/day, BOD 250→30 mg/L.
| Result | Value |
|---|---|
| Design flow | 60 m³/day |
| BOD removal | 88 % |
| Aeration volume | 17.9 m³ |
Computed live by WorkHive's calculation engine; standard: DENR DAO 2016-08.
How to use this calculator
- Enter the figures for the duty you are sizing: the worked example below uses a 500-person facility at 120 L/person/day, BOD 250→30 mg/L.
- The calculator returns Design flow, BOD removal, Aeration volume, computed per DENR DAO 2016-08.
- Check the worked example to confirm the method matches how you would do it by hand, then run your own numbers in the interactive tool.
FAQ
What is a sewage treatment plant sizing calculator BOD?
The Wastewater Treatment (STP) Calculator is a free online tool that computes finds the design flow, BOD load, and aeration tank volume for a sewage treatment plant. It shows the formula and a fully worked example so you can check the method, not just the number.
How is it calculated?
The result is computed from your inputs following DENR DAO 2016-08. The worked example on this page shows a real computation with real numbers.
Is the calculator free?
Yes. WorkHive's engineering calculators are free to use, no sign-up needed for the tools. WorkHive is a free, offline-first maintenance platform built for Philippine industrial plants.
Run it on your own numbers
Open the interactive Wastewater Treatment (STP) Calculator in WorkHive: free, no sign-up needed for the calculators.